CHEMISTRY MIDDLE SCHOOL

The s subshell can hold up to two electrons in an atom. True or False

Answers

Answer 1
Answer: The answer is true. it can only hold up to 2
Answer 2
Answer: True but this can vary 

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MIDDLE SCHOOL

Each of the following reactions is allowed to reach equilibrium in a sealed container. For which of the reactions could you shift the equilibrium to the right by decreasing the pressure? CH4(g) + 2O2(g) Double arrow yields CO2(g) + 2H2O(l)

CaCO3(s) Double arrow yields CaO(s) + CO2(g)

Br2(g) + 3Cl2(g) Double arrow yields 2BrCl3(g)

2H2S(g) + 3O2(g) Double arrow yields 2SO2(g) + 2H2O(g)

Answers

Answer:

Explanation:

Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.

This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

If the pressure is decreased, the volume will increase according to Boyle's Law. Now, according to the Le-Chatelier's principle, the equilibrium will shift in the direction where increase in pressure is taking place, i.e in a direction where number of moles of gases is increasing.

So for the give reactions, the equilibrium will shift in right if the moles of gaseous products is more than the moles of gaseous reactants.

a.

The number of moles of gases are equal on both sides.

b.

There is 1 mole of gaseous product and 0 moles of gaseous reactants.

c.

There are 2 moles of gaseous products and 4 moles of gaseous reactants.

d.

There are 4 moles of gaseous products and 5 moles of gaseous reactants.

Answer:

None of the reaction will be favored to the right by a decrease in pressure.

Explanation:

       CH₄(g) + 2O₂(g) ⇄ CO₂(g) + 2H₂O(l)  

       CaCO₃(s) ⇄  CaO(s) + CO₂(g)  

       Br₂(g) + 3Cl₂(g) ⇄  2BrCl₃(g)  

       2H₂S(g) + 3O₂(g) ⇄  2SO₂(g) + 2H₂O(g)

From Le Chatellier's principle, we must understand that pressure changes only affects reactions in gaseous phases. The second reaction will not be affected by pressure.

We are now left with three equations.

Also, increase in pressure favors sides with lower volume. We can know the volume from the coefficients in the equation. Now let us check the volumes:

          CH₄(g) + 2O₂(g) ⇄ CO₂(g) + 2H₂O(l)  

         3 moles of gases      3 moles of gases

        Br₂(g) + 3Cl₂(g) ⇄  2BrCl₃(g)  

         4 moles of gases     2 moles of gases

       2H₂S(g) + 3O₂(g) ⇄  2SO₂(g) + 2H₂O(g)

        5 moles of gases      4 moles of gases

None of the reaction will be favored to the right by a decrease in pressure.

The first reaction will not be affected by any change in pressure because the total number of moles on the two sides are equal.

The last two reactions will be favored to the right by increasing pressure and a decrease in pressure will favor the backward left reaction.

HIGH SCHOOL

The balanced chemical equation for the reaction between PCl5 and water is given below. If 3.45 moles of HCl are produced, how many moles of water reacted? PCl5 + 4H2O -> H3PO4 + 5HCl

Answers

The coefficients of the substances give you the ratio of the number of moles.
The 4 before the H2O and the 5 before the HCl tell you that for every 5 moles of HCl created, 4 moles of H2O had to react.

Therefore:

can be used to find the moles of H2O that react.


HIGH SCHOOL

There are two different compounds of sulfur and fluorine. In SF6, the mass of fluorine per gram of sulfur is 3.55 g F/g S.
In the other compound, SFX, the mass of fluorine per gram of sulfur is 1.18 g F/g S.
What is the value of X for the second compound?
Express your answer as an integer.

Answers

1.18 x 3 = 3.55 
find  ratio of F to F in each compound
.   according to law of multiple proportions  that the masses of one element which combine with a fixed mass of the second element are in a ratio of whole numbers.
now  F is  "one element" and S has  "fixed mass",
the ratio of F6 to Fx = 3:1 
thats why  x= 2
there is less F in SFx
  the ratio is 3:1.
 dividing 6 by 3 and you get 2
COLLEGE

The most negative electron affinity is most likely associated with which type of atoms?

Answers

I am unsure if this is correct since I am late (2020), but this might be the full possible question:

The most negative electron affinity is most likely associated with which type of atoms?

O large nonmetal atoms

O small nonmetal atoms

O large metal atoms

O small metal atoms

The answer is small nonmetal atoms (2nd option).

Protons I think hope that helps
MIDDLE SCHOOL

What property of an object is related to the average kinetic energy of the particles in that object? a) specific heat
b) mass
c) conductivity
d) temperature

Answers

Answer: Temperature

Explanation: Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. It is determined by the equation:

K.E= Average kinetic energy

R= gas constant

T= temperature

From the equation above, it can be seen that kinetic energy is directly related to the temperature of the system. So, if temperature is more, average kinetic energy of the system is more and vice-versa.

Thus average kinetic energy of the particles in an object is related to temperature.

C is the answer to this question...
COLLEGE

Under what condition will the change in enthalpy equal the change in internal energy for a given chemical system?

Answers

Explanation:

The change in enthalpy of a system when a chemical reaction occurs is equal to to change in internal energy of the system added to the change in the product of Volume times pressure of the system.

Now, change in enthalpy equal the change in internal energy for a given chemical system when the product of volume time pressure is Zero. That neither the does any work nor any work in done on the system.

HIGH SCHOOL

A hot air balloon starts with its temperature at 68.7°C and a pressure of 0.987 ATM and volume of 564L at what temperature in degrees Celsius while its pressure be 0.852 ATM and its volume be 625L

Answers

Answer:

54.7°C is the new temperature

Explanation:

We combine the Ideal Gases Law equation to solve this.

P . V = n. R. T

As moles the balloon does not change and R is a constant, we can think this relation between the two situations:

P₁ . V₁ / T₁ = P₂ . V₂ / T₂

T° is absolute temperature (T°C + 273)

68.7°C + 273 = 341.7K

(0.987 atm . 564L) / 341.7K = (0.852 atm . 625L) / T₂

1.63 atm.L/K = 532.5 atm.L / T₂

T₂ = 532.5 atm.L / 1.63 K/atm.L → 326.7K

T° in C = T°K - 273 → 326.7K + 273 = 54.7°C

MIDDLE SCHOOL

Which of these is a chemical property? boiling point

flammability

density

solubility

Answers

Answer:

The second choice, or flammability.

Explanation:

The flammability of something is how easy it is for it to burn or ignite.

Answer:

The Answer in flammability

Explanation:

Both fire and the fire starter are chemicals therefore its B.

MIDDLE SCHOOL

Bethany has a fish tank at her house. She uses the following data table to keep track of the nitrate and phosphate levels in the tank. Month Nitrates Phosphates
January 8.0 mg/L 0.010 mg/L
February 8.1 mg/L 0.010 mg/L
March 7.9 mg/L 0.009 mg/L
April 9.2 mg/L 0.012 mg/L
May 9.7 mg/L 0.020 mg/L
June 9.9 mg/L 0.029 mg/L
July 10.6 mg/L 0.032 mg/L
August 10.8 mg/L 0.038 mg/L
September 11.0 mg/L 0.036 mg/L

Bethany notices that the fish tank is gradually filling with algae. Based on the data she has collected, when did the problem most likely start? Explain.

Answers

The answer is: the problem start at April.

In April, there is increase in concentration of nitrates (from 7.9 mg/L to 9.2 mg/L) and increase in concentration of phosphates (from 0.009 mg/L to 0.012 mg/L).

If the aquarium is not properly maintained, the nitrate and the phosphate levels will continually rise and contribute to algae growth.

Water changes keep nitrates and phosphates down.

sudden increase of Nitrate and Phosphate in March to April that occurred, it causes the fish tank to produce algae
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